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Business Segments - Summary of Revenue by Segment and Business Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 885,252	$ 882,981	$ 836,685	$ 768,980	$ 801,023	$ 804,888	$ 778,312	$ 739,885	$ 3,373,898	$ 3,124,108	$ 2,751,534
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue									2,150,786	2,042,286	1,795,289
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue									654,118	651,116	576,829
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue									568,994	430,706	379,416
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue									2,599,763	2,392,289	2,183,914
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue									823,159	779,928	586,251
Operating Segments [Member] | Intermodal [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue									1,808,001	1,731,487	1,553,594
Operating Segments [Member] | Intermodal [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue									389,186	354,662	258,087
Operating Segments [Member] | Truck brokerage [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue									343,641	335,213	339,444
Operating Segments [Member] | Truck brokerage [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue									311,930	318,848	238,418
Operating Segments [Member] | Logistics [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue									448,121	325,589	290,876
Operating Segments [Member] | Logistics [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue									122,043	106,418	89,746
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue									(49,024)	(48,109)	(18,631)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue									(46,401)	(43,863)	(16,392)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue									(1,453)	(2,945)	(1,033)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue									$ (1,170)	$ (1,301)	$ (1,206)

X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration